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Adjusting screw "shimmy".


Improperly shimmed equilibrator equilibrator (ēkwil´ibrātur),
n an instrument or device used in achieving or maintaining a state of equilibrium.
 adjusting screws on your M198 towed howitzer howitzer: see artillery.  are bad news, crewmen.

If there is a gap above the adjusting screw, the screw will be pulled up and down as the cannon tube is elevated and depressed. A large enough gap can result in broken welds on the towers or a dished dished  
adj.
1. Concave.

2. Slanting toward one another at the bottom. Used of a pair of wheels.

Adj. 1. dished - shaped like a dish or pan
dish-shaped, patelliform

concave - curving inward
 plate on the adjusting screw surface. Enough damage means the top carriage has to be replaced.

Prevent that damage by making sure both adjusting screws on your howitzer are properly shimmed. Here's how:

1. Depress de·press
v.
1. To lower in spirits; deject.

2. To cause to drop or sink; lower.

3. To press down.

4. To lessen the activity or force of something.
 the cannon tube to a near-level elevation.

2. Using the equilibrator adjusting screw, adjust the slide to align the pointer exactly with the 0 on the scale.

3. Elevate el·e·vate  
tr.v. ele·vat·ed, ele·vat·ing, ele·vates
1. To move (something) to a higher place or position from a lower one; lift.

2. To increase the amplitude, intensity, or volume of.

3.
 the cannon tube to a high elevation (1,000 mils minimum).

If the pointer stays aligned with the 0 during elevation, the adjustment screw is properly shimmed and your howitzer is good to go. If the pointer moves away from 0, tell your mechanic. He'll report the problem to DS for fixing.
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Title Annotation:M198 Towed Howitzer ...
Publication:PS, the Preventive Maintenance Monthly
Date:Dec 1, 2003
Words:170
Previous Article:What's your motto?
Next Article:Check scale alignment.



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